[Unit]
Description=Start x11vnc at startup. 
After=multi-user.target 

[Service] 
Type=simple
Restart=on-failure
ExecStart=/usr/bin/x11vnc -auth /var/run/lightdm/root/:0 -dontdisconnect -notruecolor -noxfixes -shared -forever -rfbauth /etc/x11vnc.pass -o /var/log/x11vnc.log

[Install]
WantedBy=graphical.target
